<?php
class smtp
{
	/* Public Variables */
	var $smtp_port;
	var $time_out;
	var $host_name;
	var $log_file;
	var $relay_host;
	var $debug;
	var $auth;
	var $user;
	var $pass;

	/* Private Variables */ 
	var $sock;
	function smtp($relay_host = '', $smtp_port = 25, $auth = false, $user, $pass) {
		$this->debug = FALSE;
		$this->smtp_port = $smtp_port;
		$this->relay_host = $relay_host;
		$this->time_out = 30;
		$this->auth = $auth;
		$this->user = $user;
		$this->pass = $pass;
		$this->host_name = 'localhost';
		$this->log_file = '';
		$this->sock = FALSE;
	}

	function sendmail($to, $from, $subject = '', $body = '', $mailtype, $cc = '', $bcc = '', $additional_headers = '') {
		$mail_from = $this->get_address($this->strip_comment($from));
		$body = ereg_replace("(^|(\r\n))(\.)", "\1.\3", $body);
		$header = "MIME-Version:1.0\r\n";
		if($mailtype == 'HTML'){
			$header .= "Content-Type:text/html\r\n";
		}
		$header .= 'To: '.$to."\r\n";
		if($cc != '') {
			$header .= 'Cc: '.$cc."\r\n";
		}
		$header .= "From: $from<".$from.">\r\n";
		$header .= 'Subject: '.$subject."\r\n";
		$header .= $additional_headers;
		$header .= 'Date: '.date('r')."\r\n";
		$header .= "X-Mailer:By Redhat (PHP/".phpversion().")\r\n";
		list($msec, $sec) = explode(" ", microtime());
		$header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from.">\r\n";
		$TO = explode(",", $this->strip_comment($to));
		if($cc != '') {
			$TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
		}
		if($bcc != '') {
			$TO = array_merge($TO, explode(',', $this->strip_comment($bcc)));
		}
		$sent = TRUE;
		foreach ($TO as $rcpt_to) {
			$rcpt_to = $this->get_address($rcpt_to);
			if(!$this->smtp_sockopen($rcpt_to)) {
				$this->log_write("Error: Cannot send email to ".$rcpt_to);
				$sent = FALSE;
				continue;
			}
			if($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
				$this->log_write("E-mail has been sent to <".$rcpt_to.">");
			} else {
				$this->log_write("Error: Cannot send email to <".$rcpt_to.">");
				$sent = FALSE;
			}
			fclose($this->sock);
			$this->Log_Write("Disconnected from remote host");
		}
		return $sent;
	}
/* Private Functions */
	function smtp_send($helo, $from, $to, $header, $body = '') {
		if(!$this->smtp_putcmd('HELO', $helo)) {
			return $this->smtp_error('sending HELO command');
		}
		if($this->auth) {
			if(!$this->smtp_putcmd('AUTH LOGIN', base64_encode($this->user))) {
				return $this->smtp_error('sending HELO command');
			}
			if(!$this->smtp_putcmd('', base64_encode($this->pass))) {
				return $this->smtp_error('sending HELO command');
			}
		}
		if(!$this->smtp_putcmd('MAIL', 'FROM:<'.$from.'>')) {
			return $this->smtp_error('sending MAIL FROM command');
		}
		if(!$this->smtp_putcmd('RCPT', 'TO:<'.$to.'>')) {
			return $this->smtp_error('sending RCPT TO command');
		}
		if(!$this->smtp_putcmd('DATA')) {
			return $this->smtp_error('sending DATA command');
		}
		if(!$this->smtp_message($header, $body)) {
			return $this->smtp_error('sending message');
		}
		if(!$this->smtp_eom()) {
			return $this->smtp_error('sending <CR><LF>.<CR><LF> [EOM]');
		}
		if(!$this->smtp_putcmd('QUIT')) {
			return $this->smtp_error('sending QUIT command');
		}
		return TRUE;
	}

	function smtp_sockopen($address) {
		if($this->relay_host == '') {
			return $this->smtp_sockopen_mx($address);
		} else {
			return $this->smtp_sockopen_relay();
		}
	}

	function smtp_sockopen_relay() {
		$this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port);
		$this->sock = fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
		if(!($this->sock && $this->smtp_ok())) {
			$this->log_write("Error: Cannot connenct to relay host ".$this->relay_host);
			$this->log_write("Error: ".$errstr." (".$errno.")");
			return FALSE;
		}
		$this->log_write("Connected to relay host ".$this->relay_host);
		return TRUE;
	}

	function smtp_sockopen_mx($address) {
		$domain = ereg_replace("^.+@([^@]+)$", "\1", $address);
		if(!@getmxrr($domain, $MXHOSTS)) {
			$this->log_write("Error: Cannot resolve MX \"".$domain."\"");
			return FALSE;
		}
		foreach($MXHOSTS as $host) {
			$this->log_write("Trying to ".$host.":".$this->smtp_port);
			$this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
			if(!($this->sock && $this->smtp_ok())) {
				$this->log_write("Warning: Cannot connect to mx host ".$host);
				$this->log_write("Error: ".$errstr." (".$errno.")");
				continue;
			}
			$this->log_write("Connected to mx host ".$host);
			return TRUE;
		}
		$this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).")");
		return FALSE;
	}

	function smtp_message($header, $body) {
		fputs($this->sock, $header."\r\n".$body);
		$this->smtp_debug("> ".str_replace("\r\n", "\n"."> ", $header."\n> ".$body."\n> "));
		return TRUE;
	}

	function smtp_eom() {
		fputs($this->sock, "\r\n.\r\n");
		$this->smtp_debug(". [EOM]\n");
		return $this->smtp_ok();
	}

	function smtp_ok() {
		$response = str_replace("\r\n", "", fgets($this->sock, 512));
		$this->smtp_debug($response."\n");
		if(!ereg("^[23]", $response)) {
			fputs($this->sock, "QUIT\r\n");
			fgets($this->sock, 512);
			$this->log_write("Error: Remote host returned \"".$response."\"");
			return FALSE;
		}
		return TRUE;
	}

	function smtp_putcmd($cmd, $arg = "") {
		if($arg != "") {
			if($cmd=="") $cmd = $arg;
			else $cmd = $cmd." ".$arg;
		}
		fputs($this->sock, $cmd."\r\n");
		$this->smtp_debug("> ".$cmd."\n");
		return $this->smtp_ok();
	}

	function smtp_error($string) {
		$this->log_write("Error: Error occurred while ".$string.".");
		return FALSE;
	}

	function log_write($message) {
		echo $message."\n";
		$this->smtp_debug($message);
		if($this->log_file == '') {
			return TRUE;
		}
		$message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message;
		if(!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
			$this->smtp_debug("Warning: Cannot open log file \"".$this->log_file."\"\n");
			return FALSE;;
		}
		flock($fp, LOCK_EX);
		fputs($fp, $message);
		fclose($fp);
		return TRUE;
	}

	function strip_comment($address) {
		$comment = "\([^()]*\)";
		while(ereg($comment, $address)) {
			$address = ereg_replace($comment, "", $address);
		}
		return $address;
	}

	function get_address($address) {
		$address = ereg_replace("([ \t\r\n])+", "", $address);
		$address = ereg_replace("^.*<(.+)>.*$", "\1", $address);
		return $address;
	}

	function smtp_debug($message) {
		if($this->debug) {
			debug($message);
		}
	}
}
?>